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Support body in expansion fixing whirlbone

An internal support, expansion and fixation technology, applied in medical science, surgery, etc., can solve the problems of reduced bone mechanical properties, local bone degeneration, trauma, etc., achieve good biocompatibility, and prevent loosening, degeneration and movement.

Active Publication Date: 2012-12-19
BEIJING AKEC MEDICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technique is that after implantation, in order to prevent the implant from receding along the implantation tunnel, the implant must be made with a sufficient length so that its tail end is fixed at the lower cortical bone of the greater trochanter of the femur. When total hip replacement is performed, a tunnel hole with a larger diameter must be re-drilled at the entrance of the subtrochanteric cortical bone tunnel to remove the femoral head support, which may cause new trauma under the femoral tuberosity and may Lead to local bone degeneration and decrease in bone mechanical properties

Method used

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  • Support body in expansion fixing whirlbone
  • Support body in expansion fixing whirlbone
  • Support body in expansion fixing whirlbone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Such as figure 1 , 2As shown in 10 and 10, an internal support body for expansion and fixation of the femoral head includes a support body 1a and an internal expansion screw 2a; the support body 1a is sleeved outside the internal expansion screw 2a; the top of the support body 1a is an arc shape; the supporting body 1a is provided with downward radial expansion wings 3a, the expansion wings 3a are composed of several fins 31a, and expansion gaps 4a are formed between the fins 31a; the inner expansion screw 2a is provided with an expansion Segment 21a, after the inner expansion screw 2a is inserted into the support body 1a, the expansion segment 21a can expand the expansion wing 3a; the support body 1a is threadedly connected with the inner expansion screw 2a. The expansion section 21a of the inner expansion screw has a truncated cone structure.

[0047] The supporting body 1a is cylindrical, and its expansion wings 3a are radially located at the middle and lower part ...

Embodiment 2

[0064] Such as image 3 , 4 As shown, an internal support body for expansion and fixation of the femoral head, which includes a support body 1b and an internal expansion screw 2b; the support body 1b is sheathed outside the internal expansion screw 2b; the top of the support body 1b is arc-shaped; The supporting body 1b is provided with downward radial expansion wings 3b, the expansion wings 3b are composed of several wings 31b, and expansion gaps 4b are formed between the wings 31b; the inner expansion screw 2b is provided with an expansion section 21b After the inner expansion screw 2b is inserted into the support body 1b, the expansion section 21b can expand the expansion wings 3b; the support body 1b and the inner expansion screw 2b are screwed together. The supporting body 1b is cylindrical, and its expansion wings 3b are radially located at the middle and lower part of the supporting body.

[0065] The expansion wing 3b is composed of four wings 31b, and the expansion ...

Embodiment 3

[0071] Such as Figure 5 , Figure 6 , Figure 11 As shown, another internal support body for expansion and fixation of the femoral head includes a support body 1c and an internal expansion screw 2c; the support body 1c is sheathed outside the internal expansion screw 2c; the top of the support body 1c is arc-shaped The supporting body 1c is provided with an upward radial expansion wing 3c, the expansion wing 3c is composed of several fins 31c, and an expansion gap 4c is formed between the fins 31c; the inner expansion screw 2c itself is an expansion section After the inner expansion screw 2c is inserted into the support body 1c, the expansion wing 3c can be stretched; the support body 1c and the inner expansion screw 2c are screwed together.

[0072] The expansion wing 3c is located on the upper part of the supporting body and is radial upward; the expansion wing 3c is composed of four fins 31c, and the expansion gap 4c between the fins 31c is linear, and the fins 31c are c...

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Abstract

The invention relates to a support body in an expansion fixing whirlbone, which comprises a support main body and an internal expansion bolt, wherein the support main body is sleeved outside the internal expansion bolt; the top part of the support main body is arc-shaped; the support main body is provided with a radial expansion wing; the expansion wing is composed of a plurality of wing fins; an expansion gap is formed between each wing fin; the internal expansion bolt is provided with an expansion section; after the internal expansion bolt is arranged in the support main body, the expansion wing can be opened by the expansion section; and the support main body is in threaded connection with the internal expansion bolt. According to the invention, the support body is fixed below the whirlbone or is fixed in bone tissues around a femoral neck through the expansion of a partial structure after the support body is planted on a predetermined position below the collapsing position of the whirlbone; the support body disclosed by the invention does not need to make cortical bone on the lower part of a whirlbone greater trochanter as support mechanics basis; therefore, the support body can be relatively short so that a osteotomy space between the greater trochanter and a lesser trochanter is kept in a future total hip replacement without taking out the support body deliberately.

Description

technical field [0001] The invention relates to a supporting body, in particular to an expansion-fixing femoral head internal supporting body used for treating hip joints and specially used for the depression of the cartilage tissue of the femoral head. Background technique [0002] In recent years, the number of cases of avascular necrosis of the femoral head has been on the rise. There are many methods for the treatment of avascular necrosis of the femoral head, including medication and surgery, and the indications and curative effects are not the same. Compression surgery, free fibula grafting and artificial total hip replacement. Heart medullary decompression and free fibula transplantation are suitable for stage I and stage II femoral head necrosis, and the long-term follow-up is not very effective, and there is a possibility of further necrosis and collapse of the femoral head; artificial total hip replacement is suitable For patients with advanced osteonecrosis of th...

Claims

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Application Information

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IPC IPC(8): A61B17/56
Inventor 张卫平
Owner BEIJING AKEC MEDICAL
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